Automatic cut-off for rotary engines



(No- Model.) 2 Sheets-Sheet 1.

N. WALLERIGH.

AUTOMATIC OUT-OFP'FOR-ROTARY ENGINES.

N0. 429,204. Patented June 3, 1 890.

g M) R JIZ/Qo Jar 5 9 26% W away (No Model.) 2 Sheets-Sheet 2.

} N. WALLERIOH. AUTOMATIC GUT-OFF FOR ROTARY ENGINES.

No. 429,204. Patented June 3, 1890.

llllllllllllf! UNITED STATES PATENT FFICE.

AUTOMATIC CUT-OFF FOR ROTARY ENGINES.

SPECIFICATION forming part of Letters Patent No. 429,204, dated June 3, 1890.

Application filed February 6, 1890. Serial No. 339, l68. (No model.)

To all whom, it may concern:

Be it known that I, NICHOLAS VALLER- IOH, of Fort \Vortlnin the county of Tarrant and State of Texas, have invented a new and useful Improvement in Automatic Cut-Offs for Rotary Steam -Engines; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention relates to rotary steam engmes, and particularly to the means for aetuitting the valves controlling the steam sup- P y- V In the accompanying drawings, Figure 1 is a transverse sectional view. Fig. 2 is a sectional View through the cylinders of the rotary engine, showing the pistons in side elevation and a driving wheel, also in section. Fig. 3 is an elevation showing the drivingwheel and governor, with the cut-ofi mechanism. Fig. 4 is an elevation of the engine, showing the connection between the two valves, by means of which the valves are operated alternately. Fig 5 is a detail view of the dash-pot, which is also of my invention.

In the drawings, A represents the framework of the engine, supporting the cylinders B, which contain the pistons WV, secured to the main shaft S, extending through the walls of the cylinder. The end of this shaft extends through'to one side of the cylinder and carries the driving-wheel O. The pistons V are provided with a cam projection a, extending across their peripheries at one point, and this fits the wall of the cylinder snugly, being provided with suitable packing, as at b, if desired. A steam-space is provided between the remainder of the periphery of the piston and the wall of the cylinder, and this steam-space is supplied from the valve-chamber D through the port 0. The steam is supplied to the chamber D through the steampipe 00, and the passage of the steam between the chamber D and the steam-space o is controlled by valve n, mounted upon the shaft j, and adapted, by means of the mechanism hereinafter described, to be operated to antomatically admit steam to the cylinder according to the requirements of the work.

In order to prevent the escape of steam from the port 0 to the exhaust to and direct it against the shoulder of the piston, I pro vide a check-valve r, pivoted at I, and adapted to bear against the periphery of the piston. The check 0* is pivoted, so that when the high part of the piston comes aroundit simplylifts it into the space provided for the port 0, and as soon as it passes the check drops again into contact with the peripheryof the piston.

It will be understood that the two pistons are duplicates and are operated alike, except that they work alternately and are secured to the main shaft in different relative positions, having their controlling-valves arranged so as to be actuated alternately, thus providing for practically continuous impulses during the operation of the engine. The valve 01 is mounted upon shaft j, being secured thereto, and this shaft extends outside of the case. On the left, as shown in Fig. 2,it is connected to the arm f, which in turn is connected bya link e to an arm 0 As the arm 0 is moved to the right or left, as will be hereinafter described, this action is transmitted to the shaft j, and the shaft is thus oscillated with the valve to open or close the steam-port.

movement to the other valve through its shaft j and in a reverse direction to the oscillation of the first valve, I provide a connecting-bar h, which moves in a bearing, as shown in Fig. t, and this bar is moved in the oscillation of the arm' f through a link g, connecting the arm f and the end of the bar 71. The opposite end of the bar h is connected to the shaft jof the valve n by a. link-connection, and thus the operation of the valves, while effected from a common source of power, is in reverse directions.

011 the main shaft is a sleeve 1), loosely mounted thereon, provided with a reduced portion,which provides abearing for a collar 0, connected to the angular arm 0 which is slotted, as "shown at 5, and has sliding connection with the end of the cylinder through a projection 4, formed on or connected to the head of the said cylinder. The sleeve 1) is'eccentrically mounted on the shaft in rear of the hub of the drive-wheel, and the relative position of this sleeve and the collar 0 determines the position and regulates the action of the valves controlling the steam-inlet ports. Pivoted to the sleeve 1), to projecting studs opposite each other, are arms cl, which are connected at their outer ends with segmental In order to communicate an oscillating dash-pots 7c. and piston-connections.

10 gal force tend to move outward against the tension of the springs, thus changing the relative position of the sleeve 1) and collar 0, which shortens the movement of the arm 0, and consequently admits a limited amount of steam, thus keeping the speed of the engine constant (automatically) as the load decreases or increases.

In order to cause the governor to operate uniformly and regular and prevent any sudden action of the parts, I interpose a pneumatic dash-pot as shown, which is represented in Fig. 0 in detail. It consists of a casing inclosing a piston T, connected to a piston-rod f. The piston has valves 7,with contral openings .2, these openings being covered by screws 9 with enlarged heads, as shown in the detail figure. Springs 9 keep these valves closed normally, and in the reaction of the engine from a high to alow speed the pull on t-hepiston-rod of the dash pots is made yielding and all shock prevented by the suction within the dash-pots. 'lhe screws y govern the amount of air admit-ted through the valves, and by adjusting them from over the openings more or less, the resistance to the stroke of the piston will be regulated.

I claim as my invention 1. In combination with a rotary steam-e11- gine, a steamspace, a port leading to the steam-cylinder, an oscillating valve for controlling said port, an eccentric I), an arm 0, having a collar c engaging said eccentric, said arm being slotted, a projection 4, entering said slot, and connections between the arm and the valve adapted to oscillate the same, substantially as described.

2. In combination with the two cylinders and their pistons, oscillating valves controlling the inlet of steam, an oscillating arm f, operated from the main shaft, the bar 7t, pivoted centrally, link-connections between one end of the bar It and the arm f, and link-connections between the opposite end of the bar It and the second valve, whereby as the first valve is moved in one direction the second valve is moved in the opposite direction, substantially as described.

In combination with an engine, a drivewhcel, a cutoff and governor mechanism, including a dash-pot, provided with a piston having spring-valves with openings extending through the same, and the headed screws for closing said openings, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NICHOLAS WALLERICII.

Witnesses:

JAS. A. WILsoN, STUART HARRISON. 

